Parabolic lynchpin block



FIG. 1 is a front elevation view of a parabolic lynchpin block, showing our new design;

FIG. 2 is a back elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a perspective view thereof. 

CLAIM The ornamental design for a parabolic lynchpin block, as shown and described. 